| 摘要 |
<p>A document illuminating apparatus (10) is used to illuminate a portion of a document (14) at a scanning line (20) as the document is moved in a scanning plane (18). First and second light arrays (30, 32) are positioned symmetrically with respect to a line (24) extending perpendicularly to the scanning line (20). Each of the first and second arrays (30, 32) includes light sources (A, B, and C) each having different optical radiation and arranged in a periodic, repeating sequence ABCA to provide a superposition of light in both spatial and spectral domains at the scanning line. Light emitting diodes, for example, may be used as the light sources.</p> |
